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252
bcs,
1----555
55? --9
?55-- 8
5?5--9
5??-- 81(9*9)
??5--72(8*9)
?5?--72(8*9)
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
The answer will depend on how many digits you have at your disposal. Working with the 10 digits, and barring leading zeros, there are 8,877,690 numbers.
There are 5460 five digit numbers with a digit sum of 22.
There are 90 of them.
Three digits.